Numerical approach to inkjet hydrodynamics of microdroplets
In order to explore the formation mechanism of microdroplets in the process of inkjet printing,The CLSVOF(coupled level set and volume of fluid method)was adopted to simulate droplet formation in inkjet process.The effects of nozzle diameter,injection velocity,glycerol mass fraction and isopropyl alcohol mass fraction on the detached diameter of droplet were investigated.The results show that the droplet formation process includes four stages of expansion,stretching,transition and rapid pinch-off.The detached diameter of droplet increases significantly with nozzle diameter and injection velocity,but decreases slightly with glycerol mass fraction at high injection velocity and with isopropyl alcohol mass fraction at low injection velocity.In addition,based on the Buckingham π theorem,a novel equation for predicting the detached diameter of an inkjet droplet is developed by analyzing comprehensively the aforementioned factors,and achieves satisfied prediction results within the present simulation conditions.
万方数据
维普
